JP3081694B2 - Apparatus for drilling and / or closing fuel rod seal weld holes by laser - Google Patents
Apparatus for drilling and / or closing fuel rod seal weld holes by laserInfo
- Publication number
- JP3081694B2 JP3081694B2 JP03326316A JP32631691A JP3081694B2 JP 3081694 B2 JP3081694 B2 JP 3081694B2 JP 03326316 A JP03326316 A JP 03326316A JP 32631691 A JP32631691 A JP 32631691A JP 3081694 B2 JP3081694 B2 JP 3081694B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel rod
- window
- laser
- housing
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/032—Observing, e.g. monitoring, the workpiece using optical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/0665—Shaping the laser beam, e.g. by masks or multi-focusing by beam condensation on the workpiece, e.g. for focusing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/127—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an enclosure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/127—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an enclosure
- B23K26/128—Laser beam path enclosures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/206—Laser sealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
- G21C3/06—Casings; Jackets
- G21C3/10—End closures ; Means for tight mounting therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Laser Beam Processing (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【産業上の利用分野】本発明は、燃料棒のシール溶接孔
をレーザーによって穿孔および若しくは閉孔するための
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for drilling and / or closing a seal welding hole of a fuel rod by a laser.
【従来の技術】原子炉で用いられる燃料棒はジルコニウ
ム合金製の被覆管を有しており、この被覆管の両端に
は、被覆管内部を密封するための、被覆管と同じ材料か
らなるプラグが圧入溶接されている。燃料棒の中には燃
料ペレット積層体が装入され、プラグのうちの一方(下
側プラグという)によって支えられ、核***性コラムた
るこの燃料ペレット積層体は、この積層体と他方のプラ
グ(上側プラグという)との間に介在するスプリングに
よって下側プラグに押しつけられている。上側プラグ
は、一般に「シール溶接孔」と呼ばれる小径のオリフィ
スを有し、このシール溶接孔からヘリウムを導入して燃
料棒の加圧が行なわれるようになっており、その後この
シール溶接孔が溶接によって閉塞されるようになってい
る。この作業を、一般に「シール溶接」と呼ぶ。燃料棒
の肉厚が略0.6mmのとき、燃料棒の長さは4m程
度、直径はほぼ10mmである。シール溶接は高圧のヘ
リウムガス雰囲気中で行なわれ、小径オリフィス(通常
直径が0.8mm未満)の縁を圧潰することによって達
成される。これにおいては、溶接深さが被覆管の肉厚以
上であるという条件を厳密に満たすことが要求される。
フランス特許FR−A−2,305,827号は、この
孔をレーザービームによって穿孔し且つ閉塞することを
提唱しているがその具体的な方法については何等開示し
ていない。2. Description of the Related Art A fuel rod used in a nuclear reactor has a cladding tube made of a zirconium alloy. Plugs made of the same material as the cladding tube for sealing the inside of the cladding tube are provided at both ends of the cladding tube. Are press-fit welded. A fuel pellet stack is loaded into the fuel rods and supported by one of the plugs (referred to as a lower plug). The fuel pellet stack, which is a fissile column, comprises the stack and the other plug (upper plug). The plug is pressed against the lower plug by a spring interposed therebetween. The upper plug has a small-diameter orifice generally called a "seal welding hole", and helium is introduced from the sealing welding hole to pressurize the fuel rod. It is to be closed by. This operation is generally called “seal welding”. When the thickness of the fuel rod is about 0.6 mm, the length of the fuel rod is about 4 m and the diameter is about 10 mm. Seal welding is performed in a high pressure helium gas atmosphere and is accomplished by crushing the edge of a small orifice (typically less than 0.8 mm in diameter). In this case, it is required that the condition that the welding depth is equal to or greater than the thickness of the cladding tube is strictly satisfied.
French patent FR-A-2,305,827 proposes to pierce and close this hole with a laser beam, but does not disclose any specific method.
【発明が解決するべき課題】本発明の目的は、燃料棒の
シール溶接孔をレーザーによって穿孔および若しくは閉
孔するための装置であって、ヘリウムの消費量を減少す
ることを可能にする装置を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for laser drilling and / or closing of a seal welding hole in a fuel rod, which makes it possible to reduce the consumption of helium. To provide.
【課題を解決するための手段】本発明によれば、燃料棒
のシール溶接孔をレーザーによって穿孔および若しくは
閉孔するための装置において、レーザービームを合焦さ
せるためのハウジングであって、出口アームを有してお
り、この出口アーム中に開口する圧力ガスのためのパイ
プが設けられているようなハウジングと;レーザービー
ムを入射するための窓と前記窓に面する燃料棒を挿入し
位置決めするための通路とを有する包被体であって前記
通路にシールガスケットが設けられている包被体と;前
記ハウジングの前記出口アームに設けられた端部フラン
ジと前記窓との間に密封的に介在せしめられた塞止弁と
を含むことを特徴とする装置が得られる。本発明におい
ては、前記燃料棒の前記シール溶接孔が軸方向に配設さ
れていても良く、また前記窓が燃料棒のための座を形成
するものであっても良い。また前記包被体の、前記窓と
前記ガスケットとの間の空間は、パージガスの供給源、
真空ポンプおよび大気のうちのいずれかに接続され得る
ように構成されても良い。また、塞止弁は、回転プラグ
型のものであっても良い。以下に本発明の実施例を添付
図面を参照しつつ説明する。添付された単一の図面は、
本発明によるシール溶接孔閉塞装置の長手方向断面図で
ある。According to the present invention, there is provided a device for drilling and / or closing a seal welding hole of a fuel rod with a laser, comprising a housing for focusing a laser beam, the outlet arm comprising: A housing having a pipe for pressurized gas which opens into the outlet arm; a window for entering a laser beam and a fuel rod facing said window inserted and positioned. An enclosure having a seal gasket in said passage; and sealingly between an end flange provided on said outlet arm of said housing and said window. And an intervening stop valve. In the present invention, the seal welding hole of the fuel rod may be provided in the axial direction, and the window may form a seat for the fuel rod. Further, the space between the window and the gasket of the wrapping body is a purge gas supply source,
It may be configured so that it can be connected to any of a vacuum pump and the atmosphere. Further, the closing valve may be of a rotary plug type. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The single drawing attached
1 is a longitudinal sectional view of a seal welding hole closing device according to the present invention.
【実施例】添付図に示される装置1は、一連の燃料棒3
のそれぞれに設けられた載頭円錘型のプラグ2中に軸方
向に開口しているシール溶接孔(図では不可視)をレー
ザーによって閉塞するためのものである。各燃料棒はそ
の外殻を構成する被覆管4を有し、この被覆管4の各端
にはプラグが嵌入溶接されている。装置1は、その必須
の構成要件として、ハウジング5と、包被体6と、パル
ス型のYAGレーザー源7と、出力検出器8と、カメラ
9とを有している。ハウジング5は、直方体状の中心体
10を有し、この中に45°に傾斜した反射鏡11が設
けられている。ハウジング5の相連続する4個の面は開
放されており、計4本のアームがこれ等の開放面から延
在している。これ等4本のアームを詳述すれば次のとお
りである。 入口アーム12 これは、X−X軸(仮にこれを水平軸と想定する)方向
に延在し、管状支持部13と中心体10の近傍に位置す
るコリメータレンズ14とを有している。レーザー源7
から延びる光ファイバー15の終端がこの支持部13に
接続されており、この終端はX−X軸に整合している。 出口アーム16 これはY−Y軸(垂直方向と想定)に延在し、中心体1
0から近い順に、合焦レンズ17と、ポート18と、円
筒部19とを有している。円筒部19はその開口端に、
固定用フランジ20を具えている。ポート18は、出口
アーム16の、互いに締結される二つのフランジの間に
密封的に装着されている。30バールの圧力でヘリウム
ガスを供給するようになったパイプ21が、ポート18
の直下において、円筒部19の中に開口している。 レーザービーム制御アーム22 このアームは、X−X軸に沿って前記アーム12と反対
の方向に延在している。このアーム22は、レーザービ
ームの径を、検出器8の寸法に適合させるための収束レ
ンズ23および発散レンズ24とを有している。検出器
8はアーム22の端部に固定されている。 視覚制御アーム25 このアームは、Y−Y軸に沿って前記アーム16と反対
の方向に延在している。このアーム25はビームの合焦
レンズの径をカメラ9に適合させるための収束レンズ2
6および発散レンズ27を有している。カメラ9はアー
ム25の端部に固定されている。ハウジング5の下方に
設けられた包被体6は、Y−Y軸方向において円筒部1
9とほぼ整合している。この包被体6は円筒状の通路2
8を有し、この通路28は、上方に向って開口する段付
き凹部29に連なる。この通路28の凹部29に近い部
分には、リップを有する形式のガスケット30が設けら
れている。凹部29の径大部即わち外側部分にはベアリ
ングプレート31が密封的に設けられている。このベア
リングプレート31の中心には中央がくびれた形の孔3
2が設けられており、この孔32が包被体の窓を形成す
る。この窓32の内側部分は、塞止されるべきシール溶
接孔を中心に備えた燃料棒プラグ2と当接するシートを
構成する。包被体6に設けられた導管34は凹部29の
内側に連通している。この導管34は不図示の一方向弁
を介して、選択的に、大気圧よりも若干高圧のヘリウム
ガス源と、真空ポンプと、大気とのいずれかと連通せし
められても良い。円筒部19のフランジ20は、ソレノ
イド駆動の塞止弁36の立方体状体部35を介して包被
体6に接合している。塞止弁36は球状弁プラグ37と
回転型作動軸38とを有している。使用時には塞止弁3
6は閉鎖されている。燃料棒が無い状態で、包被体6の
内部は、導管34、凹部29、通路28を介して低圧の
ヘリウムガスでパージされる。次いで、燃料棒3が、シ
ール30を通して通路28の中に挿入される。この挿入
は、燃料棒3のプラグ2がシート33に衝当するまで行
なわれる。その後燃料棒3は、図示しないクランプ装置
によって固定保持される。導管34が真空ポンプに接続
されて燃料棒3中の空気の排気が行なわれその後閉鎖さ
れる。この真空排気工程は必ず行なわなければならない
というものではない。次いで塞止弁36が開かれる。こ
れによって約30バールのヘリウムが燃料棒を完全に満
たすとともに、弁プラグの円筒状通路39を経由するレ
ーザービームの通過を可能とする。ヘリウムによる燃料
棒内空間の充填は、シール溶接孔のレベルまで行なわれ
る。次いでレーザービームパルスによってシール溶接孔
の閉孔が行なわれる。レーザービームは、光ファイバー
15を通って伝達され、レンズ14によって平行光線と
なされ、反射鏡11によって反射され、レンズ17によ
って閉塞されるべき孔に照射される。次いで塞止弁36
が再び閉鎖され、導管34が大気に接続され、燃料棒3
が引き出され、低圧回路を経由してヘリウムガスによる
包被体内のパージングが再び行なわれる。反射鏡11は
ダイクロイックミラーであり、入射するレーザービーム
(波長λ=1.6ミクロン)の大部分(例えば97%)
を反射し、残りの僅少部を検出器8に向けて通過させ
る。更に、この鏡は、可視光線を透過せしめるので、バ
ルブ36が開状態にある間、レンズ27,26および1
7、鏡11、ポート18および窓32を通して、屈折反
射および像合成により、燃料棒3上のプラグ2をモニタ
ーすることが可能となる。検出器8は、レーザービーム
のモニタリングを可能とする他、光学要素のいずれかの
劣化やレーザー源の誤動作を検出して警報を作動させる
機能や、他の機能を有しても良い。カメラ9は、包被体
中における燃料棒の位置決めをチェックし、もし位置決
めが正しく行なわれていない場合には矢張り警報を生じ
るなどのことを可能にする。金属製の要素が互いに剛固
に固定接続され、また、光学要素もハウジング5の中に
剛固に固定されているので、装置全体が高い剛性を有し
ている。従って、ビームがいわゆるフールプルーフ的
に、高い精度をもって溶接箇所に合焦され、溶接が高品
質且つ高い再現性をもって行なわれる。しかしながら、
この装置、特にポート18は脱着可能であり、それによ
ってメンソテナンスを容易に行なうことができる。ハウ
ジングと包被体との間に弁36を設けた叙上の構成によ
り、プラグ2およびこれに隣接する燃料棒の部分の周囲
に充填されるヘリウムガスの量が極少となり、従ってヘ
リウムガスの消費量も最少となる。以上に説明した装置
を、必要に応じて各燃料棒のシール溶接孔の穿孔に使用
し得ることは明らかであろう。以上に述べた実施例にお
いてはソレノイド駆動のプラグ弁36が用いられている
が、開位置において合焦されたレーザービームを十分に
通過させることができるような、他の適当な形式の弁を
用いても良い。DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus 1 shown in the accompanying drawing comprises a series of fuel rods 3.
This is for closing the seal welding hole (invisible in the figure) which is opened in the axial direction in the mounting cone type plug 2 provided in each of the above by laser. Each fuel rod has a cladding tube 4 constituting its outer shell, and a plug is fitted and welded to each end of the cladding tube 4. The device 1 has, as its essential components, a housing 5, an envelope 6, a pulse-type YAG laser source 7, an output detector 8, and a camera 9. The housing 5 has a rectangular parallelepiped central body 10 in which a reflecting mirror 11 inclined at 45 ° is provided. Four consecutive faces of the housing 5 are open, and a total of four arms extend from these open faces. The details of these four arms are as follows. Entrance arm 12 This extends in the XX axis (assuming this is the horizontal axis) and has a tubular support 13 and a collimator lens 14 located near the central body 10. Laser source 7
The end of the optical fiber 15 extending from the support 13 is connected to the support 13, and the end is aligned with the XX axis. Exit Arm 16 This extends in the YY axis (assumed vertical) and
The focusing lens 17, the port 18, and the cylindrical portion 19 are arranged in the order from 0. The cylindrical portion 19 has an open end,
It has a fixing flange 20. The port 18 is sealingly mounted on the outlet arm 16 between two flanges fastened together. A pipe 21 adapted to supply helium gas at a pressure of 30 bar is connected to port 18
Is opened into the cylindrical portion 19 immediately below the cylindrical portion 19. Laser beam control arm 22 This arm extends in a direction opposite to said arm 12 along the XX axis. The arm 22 has a converging lens 23 and a diverging lens 24 for adjusting the diameter of the laser beam to the size of the detector 8. The detector 8 is fixed to an end of the arm 22. Visual control arm 25 This arm extends in the opposite direction to said arm 16 along the Y-Y axis. This arm 25 is a converging lens 2 for adjusting the diameter of the beam focusing lens to the camera 9.
6 and a diverging lens 27. The camera 9 is fixed to an end of the arm 25. The envelope 6 provided below the housing 5 has a cylindrical portion 1 in the Y-Y axis direction.
9 is almost matched. The wrapping body 6 is a cylindrical passage 2
8 and communicates with a stepped recess 29 which opens upwards. A gasket 30 having a lip is provided in a portion of the passage 28 near the concave portion 29. A bearing plate 31 is hermetically provided on the large-diameter portion of the concave portion 29, that is, on the outer portion. The center of this bearing plate 31 is a hole 3 with a constricted center.
2 are provided, the holes 32 forming windows of the envelope. The inner part of the window 32 constitutes a seat which comes into contact with the fuel rod plug 2 mainly provided with a seal welding hole to be closed. A conduit 34 provided in the envelope 6 communicates with the inside of the recess 29. This conduit 34 may be selectively connected to one of a helium gas source slightly higher than the atmospheric pressure, a vacuum pump, and the atmosphere via a one-way valve (not shown). The flange 20 of the cylindrical portion 19 is joined to the envelope 6 via the cubic portion 35 of the solenoid-driven closing valve 36. The closing valve 36 has a spherical valve plug 37 and a rotary operating shaft 38. Stop valve 3 when used
6 is closed. Without the fuel rods, the inside of the envelope 6 is purged with low-pressure helium gas through the conduit 34, the recess 29, and the passage 28. The fuel rod 3 is then inserted through the seal 30 and into the passage 28. This insertion is performed until the plug 2 of the fuel rod 3 hits the seat 33. Thereafter, the fuel rod 3 is fixedly held by a clamp device (not shown). A conduit 34 is connected to the vacuum pump to evacuate the air in the fuel rods 3 and then closed. This evacuation step is not necessarily required. Next, the closing valve 36 is opened. This allows approximately 30 bar of helium to completely fill the fuel rod and allow passage of the laser beam through the cylindrical passage 39 of the valve plug. The filling of the fuel rod space with helium is performed to the level of the seal welding hole. Next, the seal welding hole is closed by the laser beam pulse. The laser beam is transmitted through an optical fiber 15, collimated by a lens 14, reflected by a reflecting mirror 11, and directed to a hole to be closed by a lens 17. Then the closing valve 36
Is closed again, the conduit 34 is connected to the atmosphere, and the fuel rod 3
Is drawn out, and purging of the inside of the envelope by helium gas is performed again via the low-pressure circuit. The reflecting mirror 11 is a dichroic mirror, and most (eg, 97%) of the incident laser beam (wavelength λ = 1.6 μm)
Is reflected, and the remaining small portion is passed toward the detector 8. In addition, the mirror transmits visible light so that while the bulb 36 is open, the lenses 27, 26 and 1
7, through the mirror 11, the port 18 and the window 32, it is possible to monitor the plug 2 on the fuel rod 3 by refraction reflection and image synthesis. In addition to enabling the monitoring of the laser beam, the detector 8 may have a function of detecting any deterioration of the optical element or malfunction of the laser source and activating an alarm, or another function. The camera 9 checks the positioning of the fuel rods in the wrapping body and enables, for example, to generate an arrowhead alarm if the positioning is not performed correctly. Since the metallic elements are rigidly connected to each other and the optical elements are also rigidly fixed in the housing 5, the entire device has high rigidity. Therefore, the beam is focused on the welding portion with high accuracy in a so-called foolproof manner, and welding is performed with high quality and high reproducibility. However,
The device, especially the port 18, is detachable, thereby facilitating maintenance. Due to the above-described configuration in which the valve 36 is provided between the housing and the envelope, the amount of helium gas charged around the plug 2 and the portion of the fuel rod adjacent thereto is minimized, and thus the consumption of helium gas is reduced. The amount is also minimal. It will be apparent that the apparatus described above can be used to drill seal weld holes in each fuel rod as needed. Although a solenoid driven plug valve 36 is used in the above described embodiment, any other suitable type of valve that allows sufficient passage of the focused laser beam in the open position may be used. May be.
【図1】本発明を実施する燃料棒シール溶接孔閉孔装置
の長手方向断面図である。FIG. 1 is a longitudinal sectional view of a fuel rod seal welding hole closing device embodying the present invention.
1 シール溶接孔閉孔装置 2 プラグ 3 燃料棒 5 ハウジング 6 包被体 32 窓 36 塞止弁 DESCRIPTION OF SYMBOLS 1 Seal welding hole closing apparatus 2 Plug 3 Fuel rod 5 Housing 6 Envelope 32 Window 36 Closure valve
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI B23K 26/12 B23K 26/12 (56)参考文献 特開 昭60−113198(JP,A) 特開 昭63−286797(JP,A) 特開 昭63−302399(JP,A) 特開 平6−99295(JP,A) (58)調査した分野(Int.Cl.7,DB名) G21C 21/02 ────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. 7 Identification code FI B23K 26/12 B23K 26/12 (56) References JP-A-60-113198 (JP, A) JP-A-63-286797 (JP) JP-A-63-302399 (JP, A) JP-A-6-99295 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G21C 21/02
Claims (4)
て穿孔および若しくは閉孔するための装置において、 レーザービームを合焦させるためのハウジング(5)で
あって出口アーム(16)を有し、この出口アーム中に
開口する圧力ガスのためのパイプ(21)が設けられて
いるハウジング(5)と、 レーザービームを入射するための窓(32)と前記窓に
面する燃料棒を挿入し位置決めするための通路(28)
とを有する包被体(6)であって前記通路にシールガス
ケット(30)が設けられている包被体(6)と、 前記ハウジングの前記出口アーム(16)に設けられた
端部フランジ(20)と前記窓(32)との間に窓封的
に介在せしめられた塞止弁(36)とを含むことを特徴
とする装置。1. A device for drilling and / or closing a seal welding hole of a fuel rod by means of a laser, comprising a housing (5) for focusing a laser beam and having an outlet arm (16). A housing (5) provided with a pipe (21) for a pressure gas opening in an outlet arm, a window (32) for injecting a laser beam and a fuel rod facing the window are inserted and positioned. Passage for (28)
An enclosure (6) having a seal gasket (30) in the passage, and an end flange (6) provided on the outlet arm (16) of the housing. 20. A device comprising a blocking valve (36) sealingly interposed between said window (32) and said window (32).
軸方向に配設されており、前記窓(32)が前記燃料棒
のための座(33)を形成していることを特徴とする請
求項1記載の装置。2. The fuel rod according to claim 1, wherein the seal welding holes of the fuel rod are arranged axially and the window forms a seat for the fuel rod. The apparatus according to claim 1, wherein:
前記ガスケット(30)との間との空間が、パージガス
の供給源、真空ポンプおよび大気のうちのいずれかに接
続され得るようになっていることを特徴とする請求項1
および2のいずれかに記載の装置。3. A space between the window (32) and the gasket (30) of the envelope (6) is connected to one of a purge gas supply source, a vacuum pump, and the atmosphere. 2. The method according to claim 1, wherein
The device according to any one of claims 2 and 3.
7)を有する形式のものであることを特徴とする請求項
1乃至3のいずれかに記載の装置。4. The stop valve (36) includes a rotary plug (3).
Device according to any of claims 1 to 3, characterized in that it is of the type having 7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9012362 | 1990-10-08 | ||
FR9012362A FR2667527B1 (en) | 1990-10-08 | 1990-10-08 | DRILLING AND / OR LASER CLOSURE EQUIPMENT OF THE POCKET HOLE OF A FUEL PENCIL. |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH075290A JPH075290A (en) | 1995-01-10 |
JP3081694B2 true JP3081694B2 (en) | 2000-08-28 |
Family
ID=9401005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03326316A Expired - Fee Related JP3081694B2 (en) | 1990-10-08 | 1991-10-08 | Apparatus for drilling and / or closing fuel rod seal weld holes by laser |
Country Status (8)
Country | Link |
---|---|
US (1) | US5192846A (en) |
EP (1) | EP0480792B1 (en) |
JP (1) | JP3081694B2 (en) |
CN (1) | CN1032048C (en) |
CZ (1) | CZ279123B6 (en) |
DE (1) | DE69114663T2 (en) |
ES (1) | ES2080925T3 (en) |
FR (1) | FR2667527B1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4310409C2 (en) * | 1993-03-31 | 1998-01-15 | Dresden Ev Inst Festkoerper | Method and device for beam diagnosis in the defined laser irradiation |
FR2805075B1 (en) * | 2000-02-15 | 2002-05-10 | Franco Belge Combustibles | METHOD FOR CONTROLLING A SEALED CLOSURE OPERATION BY WELDING THE END OF A FILLING CHANNEL THROUGH THE TOP CAP OF A NUCLEAR FUEL PENCIL |
EP1477264A1 (en) * | 2003-05-16 | 2004-11-17 | Lasag Ag | Apparatus for generating a rotating laser beam |
CN102294545B (en) * | 2010-06-23 | 2014-10-29 | 宝山钢铁股份有限公司 | Laser penetration welding seam formation control method for Hass alloy conductive roller |
DE102014218333B9 (en) * | 2014-09-12 | 2016-09-01 | Schott Ag | Method and device for introducing protective gas into a receiver tube |
DE102015102732A1 (en) * | 2015-02-25 | 2016-08-25 | Areva Gmbh | Apparatus and method for testing a fuel rod of a fuel assembly |
US20160303688A1 (en) * | 2015-04-20 | 2016-10-20 | Ford Motor Company | Gas Enclosure and Particle Shield for Laser Welding System |
DE102016201652B3 (en) * | 2016-02-03 | 2017-02-23 | Schott Ag | Method for discharging a hydrogen storage in parabolic trough receivers |
DE102016201654B3 (en) * | 2016-02-03 | 2017-03-02 | Schott Ag | Method and device for discharging a hydrogen storage in parabolic trough receivers |
CN106051225B (en) * | 2016-07-21 | 2018-06-19 | 上海佳革智能科技有限公司 | The sealing device and its drainage method of nuclear power evaporator C-shaped ring punching drainage repair |
US10471539B2 (en) * | 2016-09-28 | 2019-11-12 | Bombardier Transportation Gmbh | Containment device for a laser head and associated manufacturing method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4020673A (en) * | 1975-01-14 | 1977-05-03 | Exxon Nuclear Company, Inc. | Fuel rod pressurization |
SE7602419L (en) * | 1975-03-24 | 1976-09-25 | Westinghouse Electric Corp | PROCEDURE FOR PRESSUREIZING THE SEAL OF NUCLEAR FUEL STICKS |
US4136553A (en) * | 1977-09-08 | 1979-01-30 | Westinghouse Electric Corp. | Method for verifying the pressure in a nuclear reactor fuel rod |
JPS5499750A (en) * | 1978-01-25 | 1979-08-06 | Toshiba Corp | Method and apparatus for tight seal laser welding of end part of nuclear fuel rod for reactor |
US4727237A (en) * | 1987-05-04 | 1988-02-23 | Hewlett-Packard Company | Pyrolysis coated optical fiber splices: apparatus and method |
-
1990
- 1990-10-08 FR FR9012362A patent/FR2667527B1/en not_active Expired - Fee Related
-
1991
- 1991-09-26 DE DE69114663T patent/DE69114663T2/en not_active Expired - Fee Related
- 1991-09-26 ES ES91402579T patent/ES2080925T3/en not_active Expired - Lifetime
- 1991-09-26 EP EP91402579A patent/EP0480792B1/en not_active Expired - Lifetime
- 1991-09-27 US US07/766,747 patent/US5192846A/en not_active Expired - Lifetime
- 1991-10-04 CZ CS913039A patent/CZ279123B6/en not_active IP Right Cessation
- 1991-10-07 CN CN91110838A patent/CN1032048C/en not_active Expired - Fee Related
- 1991-10-08 JP JP03326316A patent/JP3081694B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69114663D1 (en) | 1995-12-21 |
JPH075290A (en) | 1995-01-10 |
US5192846A (en) | 1993-03-09 |
FR2667527A1 (en) | 1992-04-10 |
CZ279123B6 (en) | 1995-01-18 |
FR2667527B1 (en) | 1993-01-22 |
CN1032048C (en) | 1996-06-19 |
EP0480792B1 (en) | 1995-11-15 |
ES2080925T3 (en) | 1996-02-16 |
CS303991A3 (en) | 1992-04-15 |
EP0480792A1 (en) | 1992-04-15 |
CN1061370A (en) | 1992-05-27 |
DE69114663T2 (en) | 1996-04-18 |
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